Writable optical disk recording apparatus

Details Writable optical disk recording apparatus Writable optical disk recording apparatus

1992-11-23

1994-10-04

Psitos, Aristotelis

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369116, 369 53, 369 59, G11B 7125

Patent

active

053532708

ABSTRACT:
The present invention is directed to a writable optical disk recording apparatus in which an output power of a laser beam is controlled even during a recording period. During a calibration mode, a reproduced (reflected) signal from a matrix circuit (12) is supplied to level hold circuits (37), (38). The level hold circuits (37), (38) are controlled at predetermined timings relative to recording EFM (eight-to-fourteen modulated) signals of bit lengths (3T) and (11T) under the control of a microcomputer (CPU) (31). Signals from the level hold circuits (37), (38) are supplied to a calculating circuit (39) which calculates, for example, a difference or ratio between the two signals. A calculated value is stored in a memory (40). The value stored in the memory (40) and a value newly calculated by the calculating circuit (39) during EFM data recording are compared with each other by a subtracting circuit (41). A compared output is selected by a switch (34) and then supplied through a subtracting circuit (35) to control a laser driver (3).

REFERENCES:
patent: 5070495 (1991-12-01), Bletscher, Jr. et al.
Patent Abstracts of Japan, vol. 14, No. 230 (P-1048), 16 May 1990 & JP-A-20 54 424 (Nippon Columbia), 23 Feb. 1990.

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